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/*
* Copyright (c) 2005-2006 The Regents of The University of Michigan
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer;
* redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution;
* neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Authors: Korey Sewell
* Kevin Lim
*/
#ifndef __CPU_O3_SCOREBOARD_HH__
#define __CPU_O3_SCOREBOARD_HH__
#include <iostream>
#include <utility>
#include <vector>
#include "base/trace.hh"
#include "cpu/o3/comm.hh"
/**
* Implements a simple scoreboard to track which registers are ready.
* This class assumes that the fp registers start, index wise, right after
* the integer registers. The misc. registers start, index wise, right after
* the fp registers.
* @todo: Fix up handling of the zero register in case the decoder does not
* automatically make insts that write the zero register into nops.
*/
class Scoreboard
{
public:
/** Constructs a scoreboard.
* @param activeThreads The number of active threads.
* @param _numLogicalIntRegs Number of logical integer registers.
* @param _numPhysicalIntRegs Number of physical integer registers.
* @param _numLogicalFloatRegs Number of logical fp registers.
* @param _numPhysicalFloatRegs Number of physical fp registers.
* @param _numMiscRegs Number of miscellaneous registers.
* @param _zeroRegIdx Index of the zero register.
*/
Scoreboard(unsigned activeThreads,
unsigned _numLogicalIntRegs,
unsigned _numPhysicalIntRegs,
unsigned _numLogicalFloatRegs,
unsigned _numPhysicalFloatRegs,
unsigned _numMiscRegs,
unsigned _zeroRegIdx);
/** Destructor. */
~Scoreboard() {}
/** Returns the name of the scoreboard. */
std::string name() const;
/** Checks if the register is ready. */
bool getReg(PhysRegIndex ready_reg);
/** Sets the register as ready. */
void setReg(PhysRegIndex phys_reg);
/** Sets the register as not ready. */
void unsetReg(PhysRegIndex ready_reg);
private:
/** Scoreboard of physical integer registers, saying whether or not they
* are ready.
*/
std::vector<bool> regScoreBoard;
/** Number of logical integer registers. */
int numLogicalIntRegs;
/** Number of physical integer registers. */
int numPhysicalIntRegs;
/** Number of logical floating point registers. */
int numLogicalFloatRegs;
/** Number of physical floating point registers. */
int numPhysicalFloatRegs;
/** Number of miscellaneous registers. */
int numMiscRegs;
/** Number of logical integer + float registers. */
int numLogicalRegs;
/** Number of physical integer + float registers. */
int numPhysicalRegs;
/** The logical index of the zero register. */
int zeroRegIdx;
int currentSize;
void
resize(int newSize)
{
currentSize = newSize;
regScoreBoard.resize(newSize);
}
bool
indexInBounds(int idx)
{
return idx < currentSize;
}
};
#endif
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